Microswitch

Abstract

A microswitch in which a good snap action feeling is obtained and an operating stroke is enhanced is provided. A compession spring is interposed between a movable member and a swingable lever which are respectively pivotaly supported at close positions. The swingable lever is operated by a push button which is vertically slidable. Further, restricting plates to restrict the motion in the width direction of the movable member are attached to the push button. A positioning member to hold the swingably lever to the position which faces the push button when the microswitch is assembled is also provided.

What is claimed is: 
     
       1. A microswitch comprising: a switch casing in which a first common terminal member and at least one second terminal member for fixed contact are fixed to a lower plate portion;   a hole formed in a top plate of the switch casing located between inner end portions of said first common terminal member and said second terminal member for fixed contact;   a push button which is vertically movably inserted into said hole;   a movable member provided with a movable contact at a free end portion thereof and pivotally supported at the inner end portion of the first common terminal member at a base end portion thereof, said movable contact facing a fixed contact fixed to the inner end portion of the second terminal member,   a swingable lever pivotally supported at the inner end portion of the first common terminal member at a base end portion thereof and operated by said push button at a free end thereof wherein   said push button is capable of moving towards a space located between the base end portion of said swingable lever and the free end portion of said movable member; and   a compression spring, one end of which is pivotally engaged with a central portion of said swingable lever and another end of which is engaged with a free end portion of said movable member.   
     
     
       2. A microswitch according to claim 1, wherein a swingable lever positioning projection is provided in said switch casing to deform the free end portion of said swingable lever. 
     
     
       3. A microswitch according to claim 1, wherein a positioning projection for said swingable lever is formed by a bent member on the inner end side of said common terminal member. 
     
     
       4. A microswitch according to claim 1, further having: a pair of front and rear restricting members, formed vertically downwardly at lower ends of said push button, for restricting the position of said movable member in a width direction; and   guide portions, formed on an inner wall of said switch casing, for guiding the vertical motions of said restricting members.